Liquid Crystal Projector Color Panel Response Synchronization
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Solution Overview
Problem
In liquid crystal projectors, differences in optical responsiveness between color panels lead to incorrect color representation, where an achromatic color is visually recognized as chromatic due to unequal transmittance across panels.
Innovation Solution
A liquid crystal projector with a display control circuit that adjusts voltage levels for each color panel based on specific threshold values and performs overdrive processing to synchronize transmittance, using a gray scale level conversion unit and black floating process to correct voltage levels and improve optical responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If overdrive processing is performed to improve optical responsiveness, then response speed is improved, but voltage control precision deteriorates
Solution Approach 1:
The patent applies different voltage correction strategies to different color panels (R, G, B) based on their specific optical responsiveness characteristics. Each panel receives tailored overdrive processing parameters rather than a uniform approach, allowing optimization of response speed while maintaining voltage control precision for each color channel independently.
Solution Approach 2:
The system dynamically adjusts voltage parameters including correction amounts and correction periods based on gray scale transitions. By changing voltage application timing and magnitude parameters adaptively, the patent achieves improved optical responsiveness while maintaining precise control through calculated correction values stored in lookup tables.
2Manufacturing precision
If different voltage levels are applied to each color panel to match transmittance, then color accuracy is improved, but device complexity increases
Solution Approach 1:
The patent pre-calculates and stores voltage correction amounts and correction periods in lookup tables for all possible gray scale transitions before operation. This preliminary preparation eliminates the need for complex real-time calculations, reducing control circuit complexity while maintaining precise color accuracy through stored correction parameters.
Solution Approach 2:
The system uses lookup tables that copy pre-determined correction patterns for different gray scale transitions. Instead of computing corrections dynamically, the control circuit retrieves stored correction data, simplifying the control logic while ensuring accurate voltage adjustment for each color panel.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution ensures accurate color representation by synchronizing transmittance across color panels, reducing the likelihood of chromatic aberration and improving image clarity.
Implementation Method 1
a first liquid crystal element to which a voltage is applied in accordance with the first data signal, the first liquid crystal element emitting incident light of the first color as first emission light at a ratio corresponding to an applied voltage
Data Source
AI summary
When, in a liquid crystal projector, optical responsiveness of a liquid crystal panel corresponding to G is better than optical responsiveness of a liquid crystal panel corresponding to R, a display control circuit performs a tr correction and a tf correction of overdrive processing for R, and performs only the tr correction of the overdrive process for G, and does not perform the tf correction for G. The display control circuit performs a black floating process for R, G, and B.